Balanced slide-valve



UNITED STATES ATENT OFFICE.

FERDINAND ROUHOW, OF BROOKLYN, NEW YORK.

BALANCED s| DE-VALVE.

SPECIFICATION forming part of Letters Patent No. 270,986, dated January 23, 1883.

I Application filed June 15. 1882. (No model.)

1' 0 all whom it may concern Be it known that I, FERDINAND Roonow, of Brooklyn,in the county of Kings and State of New York, have invented a new and Improved Balanced Slide-Valve, of which the following is a specification.

Figure l is a vertical central section of my improved slide-valve. Fig. 2 is a bottom view of same. Fig. 3 is atop view of the springrings used therein; Fig. 4, a bottom view of the plates that are placed on top of said valve.

This invention relates to a new construction of slide-valve, which is adapted to receive steam eitherthrough the usual exhaust-port or through a separate or outer supply-thatis to say, either on the inner or on the outer side of the valve.

The invention is more particulariyintended to be used in connection with the reversible engine described in the application for a patent filed by me March 16, 1882, and numbered 55,465.

It consists in the use, between two vertical sections of the valve, of two beveled springrings, one applied to the outer, the other to the inner, side ofthe said sections, so that the valve will be made tight-fitting by that one of the rings which is in contact with the steamsupply.

In the arrangement of parts described in my aforesaid application it appears essential that the slide-valves in the steam-chests should be of such a character as to allow the steam to enter either within the hollow of the slidevalves or on the outside of the valves. To this end the particular construction of slidevalve which is shown in Figs. 1, 2, 3, and 4 is most desirable, said slide-valves being so arranged that when the piston of the corresponding cylinder is at the end of the stroke the valve is in the middle of its position, covering all the ports, as shown in Fig. 1, which figure shows a sectional view of the steam-chest F and slide -valve I therein contained. The slide-valve I is made in two parts, a and b, both of circular form, excepting at the lower end of a, which is rectangular. The lower part, a, rests on the cylinder-face, and has lips or lower faces that enable it to close the ports m and n. The upper part, b, of the slide-valve is also circular, and of about the size, horizontally considered, of the part a, and has cast or otherwise secured onto it an inner cross or guide piece, (I, that enters into the part a and keeps the parts a and b at all times properly aligned. In the top of the steam-chest and on top of the slide-valve are two wedgeshaped plates, 0 andf, the lower of which is suspended by screws 9, while the upper can be adjusted by a horizontal screw, it. The lower edge of the part b is circular when looked at from below, and so is the upper edge of the part a when seen from above, and these edges are \I-shaped, vertically considered, as shown in Fig. 1. Between these V-shaped edges of the parts a. and b are interposed the two spring-rings v1 and j. The inner ring, i, bears against the inner tapers of the V-shaped edges of the parts a and b, while the outer ring, j, bears against the outer tapers of said edges, all as clearly shown in Fig. 1. Now, it is evident that when steam is admitted to the inner part of the valve Isay through the port 0- it will expand within the valve I and press the inner spring-ring, t, outward, causing the same to press in turn against the inclined innor contact-edges of the parts aand b, spreading them apart, thus tightening the valve against the lower and upper faces. when steam is admitted to the steam-chest F outside of the valve I its pressure is exerted on the outer ring, j, which in like manner will cause the parts a and b to be spread apart, thus under all circumstances insuringa tight fit of the valve against the surfaces between which it moves. By the screws 9 and h the distance between the upper and lower contactsurfaces of the valve can always be regulated as circumstances may require.

- It has always been a diflicult problem to produce a thoroughly practical slide-valve which will keep completely steam-tight, no matter Again, 4

whether the steam enters inside of the valve oroutside, and which will by its own wear and tear tend to remain steam-tight, and which, also, will not be liable to stick and rest its partstogether, and does not depend upon the 1 outer bevels of said sections, respectively, substantially as herein shown and described.

2. The combination of the section a with the section b, guide-cross d,inner spring-ring, 2 and outer spring-ring, j, substantially as herein shown and described.

FERDINAND ROU HOW.

\Vitnesses:

WILLY G. E. SCHULTZ, WILLIAM H. G. SMITH. 

